[cairo] Cleaning up the PDF API

[Carl Worth]

On Mon, 16 May 2005 13:28:25 -0400, Kristian Høgsberg wrote:
> We do have this two phases destruction on all surfaces.  It's just that
> in the stream based case, the underlying resource that we destroy going
> from active to finished is user supplied and we don't know how to
> destroy it - thus the callback.

But could we move the user_data destruction to the active->finished
transition? If so, it seems we could unify these two concepts and
simplify things for the user.

Or does the user really care about the finished->destroyed transition?
It doesn't seem immediately useful to me, but I'm clearly not
well-versed in all the anticipated uses of user_data.

-Carl
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